diff --git a/README.md b/README.md
index c4e0952..bd52a26 100644
--- a/README.md
+++ b/README.md
@@ -272,6 +272,7 @@ All of the variables below are optional.
 | `TAR1090_IMAGE_CONFIG_TEXT` | Text to display for the config link                                                                                                                                                                    | `null`                       |
 | `TAR1090_DISABLE`           | Set to `true` to disable the web server and all websites (including the map, `graphs1090`, `heatmap`, `pTracks`, etc.)                                                                                 | Unset                        |
 | `READSB_ENABLE_HEATMAP`    | Set to `true` or leave unset to enable the HeatMap function available at `http://myip/?Heatmap`; set to `false` to disable the HeapMap function | `true` (enabled) |
+| `READSB_ENABLE_TRACES`     | Save detailed globe history traces (1 gzip compressed json file per day and airframe, use MAX_GLOBE_HISTORY so you don't run out of inodes / diskspace)                                                 | `false` |
 | `TAR1090_ENABLE_ACTUALRANGE`    | Set to `true` or leave unset to enable the outline of the actual range of your station on the map; set to `false` to disable the this outline | `true` (enabled) |
 | `TAR1090_AISCATCHER_SERVER` | If you want to show vessels from your AIS-Catcher instance on the map, put the (externally reachable) URL of your AIS-Catcher or ShipFeeder website in this parameter (incl. `https://`). Note - if you are using "barebones" AIS-Catcher you should add `GEOJSON on` after the `-N` parameter on the `AIS-Catcher` command line. If you use [docker-shipfeeder](https://github.com/sdr-enthusiasts/docker-shipfeeder), no change is needed for that container | Empty |
 | `TAR1090_AISCATCHER_REFRESH` | Refresh rate (in seconds) of reading vessels from your AIS-Catcher instance. Defaults to 15 (secs) if omitted | `15` |
@@ -458,7 +459,7 @@ Where the default value is "Unset", `readsb`'s default will be used.
 | `READSB_STATS_EVERY`          | Number of seconds between showing and resetting stats.                                                                         | `--stats-every=<sec>`          | Unset   |
 | `READSB_STATS_RANGE`          | Set this to any value to collect range statistics for polar plot.                                                              | `--stats-range`                | Unset   |
 | `READSB_RANGE_OUTLINE_HOURS`  | Change which past timeframe the range outline is based on                                                                      | `--range-outline-hours`        | `24`    |
-| `MAX_GLOBE_HISTORY`           | Maximum number of days that `globe_history` data (used to produce heatmaps and ptracks) is retained. Note - this parameter doesn't affect the data used to produce `graphs1090` statistics | | Unset |
+| `MAX_GLOBE_HISTORY`           | Maximum number of days that `globe_history` data (used to produce heatmaps and replay) is retained. Note - this parameter doesn't affect the data used to produce `graphs1090` statistics | | Unset |
 
 ### AutoGain for RTLSDR Devices
 
diff --git a/rootfs/etc/s6-overlay/scripts/readsb b/rootfs/etc/s6-overlay/scripts/readsb
index ca184fd..7c5b149 100755
--- a/rootfs/etc/s6-overlay/scripts/readsb
+++ b/rootfs/etc/s6-overlay/scripts/readsb
@@ -61,6 +61,11 @@ if chk_enabled "${READSB_ENABLE_HEATMAP:-true}"; then
     READSB_CMD+=("--heatmap=${READSB_HEATMAP_INTERVAL:-15}")
 fi
 
+if chk_enabled "${READSB_ENABLE_TRACES}"; then
+    READSB_CMD+=("--write-globe-history=/var/globe_history")
+fi
+
+
 if chk_enabled "${READSB_FORWARD_MLAT}"; then
     "${s6wrap[@]}" echo "WARNING -- READSB_FORWARD_MLAT has been set! Do not feed the output of this container to any aggregators!"
     READSB_CMD+=("--forward-mlat")